Improvement in device for controlling- engines



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'gtluitml 0% n AAL@ 819 JEAN JOSEPH LEON FARCOT, O

Letters Patent No. 85,439, dated Decemberl 29, 1868.

F SAINT OUEN, (SEINE,) FRANCE.

IMPROVEMENT IN DEVICE PQR ooNTRoLnING ENGINES.

The Schedule referred to in these Lettera Patent and making part of the same.

To all whom it may concern:

Be it known that I, J EAN JOSEPH LON FARCOT, of' Saint Ouen, (Seine,) Empire of France, have invented a new and useful Device for Controlling the Action of Engines or Motors; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, and in which- Figure l is a longitudinal mainly sectional view of a motor having my invention applied to it.

Figure 2 is a vertical transverse section, taken as indicatedlby the line a: :I: in iig. l. v

Figure 3 is a plan of a portion of the motor as represented in'g. 1.

Similar letters of reference indicate corresponding parts throughout the several figures.

The object of my invention is to construct an engine or motor, the action vof Which may be entirely and quickly controlled by the operator, so that the engine may be stopped or reversed instantaneously, and at any point desired, by the arrangement of the valverod of the engine with relation to the rocking shaft, which is operated by a bell-crank and connecting-rod, said bell-crank being attached to an oscillating arm, which is rigidly secured to the main shaft, and receives motion by being connected to the piston-rod.

To enable others skilled in the art to construct and use my invention, I will proceed to describe the same with reference to the drawing.

A is a cylinder, in which steam, air, gas, or any suit-l able vapor or Huid may be used'as the motive-power, and B, a piston, arranged to reciprocate therein, and

serving to impart motion to a shaft, O, by means of-a connecting-rod, E, and arm or crank, Gr.

H is the valve, which regulates the admission of steam into the cylinder, and which is so constructed that the least possible power is required to operate it.

' This is accomplished by reducing the length of the valve-throw as much as circumstances will allow, and also by reducing the friction of its operating-parts, which latter end is attained by providing the'valveloperating arm b with a sliding pivot, c.

Said pivot moves loosely in a corresponding cavity in the under end of the arm b, and is forced to entera shallow cavity in the valve by the force of a weak spring, e, to keep it always in' contact with the valve.

The arm b is rigidly attached to thevalve-stem d.

In this way motion is imparted to the valve with very little friction.

On the oscillating lever or crank-arm G, a bell-crank, I, is secured, the same being hung to turn freely'on a pin, j', as far ascertain stops, t i, will allow.l

K is a rod, attached to 4one end of the bell-crank, I, while a short bar, g, connects the other end .to an arm, h,- fast on a rockingshaft, L.

To the end of this shaft, another arm, k, is fastened, which establishes a connection yvith the valve H, by means of the rod M and arin N, which latter isrigidly secured to the valve-stem d.

a c are steam-ports, and a. is the exhaust-port.

From the above. description, it will be seen that it requires but a'slight movement of the rodK andbellcrank I, to change the position of the valve H, and it is also evident that the position of the-valve H is wholly dependent on that of the bell-crank I. This crank, though swingingwith the arm G, is still free to be operated, by means of the rod K, in any direction, and to any extent, whereby the engine may, instante;-

of the operator, and by or through any known or suitable mechanical device. y

The valve-controlling device herein described may be applied to various kinds of motors, and admits of different modiiications as regards arrangement of its drawn from the centre of the shaft Cl to the centre of the pinby which the connecting-rod F is united tothe lever G; and said bell-crank may have itskfulcrum f outside instead of inside the connectingfrod attachment to the lever G, that is, beyond said attachment, instead of betweenit and the main shaft C. In each the valve is operated, moves with the main crank G, and requires no separate support for its fulcrum.

What I claim, and wish to secure by Letters Patent, is-

The arrangement of the bell-crank I, pivoted to the main lever G, and of the rock-shaft L, operated thereby to control the position of the valve by lever's and connections, substantially as shown and described.

In testimony whereof, I have signed my name to this specification, before two subscribing Witnesses.. J. FARCOT.

Witnesses F. OLcoTr,

DUMAS.

neously, be started, reversed, or stopped, at theY will parts; thus, the bell-crank I may be pivoted' to thecrank, G, at a point intersected by a straight line,

and all of such cases the bell-crank I, through which 

